Burglar-alarm lock



S.B.RODGERS BURGLAR ALARM LOCK APPLICATION FILED SEPT-2]. I911- Patented Dec. 16,1919,

2 SHEETS-SHEET I;

S. B. RODGERS.

BURGLAR ALARM LOCK.

APPLlCATlON FILED sEPT.2I. 1917.

1 ,325, 1 1 2. I Patented Dec. 16, 1919.

, 2 SHEETS-SHEET 2- F 7 1 UNITED STATES PATENT OFFICE.

SIMPSON B. RODGERS, 0F MACON, GEORGIA.

BURGLAR-ALARM LOCK.

Application filed September 27, 1917.

To all whom it may concern:

Be it known that I, SIMPSON B. RODGERS, a citizen of the United States, residing at Macon, in the county of Bibb and State of Georgia, have invented certain new and useful Improvements in Burglar-Alarm Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as'will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to looks and more particularly to alarm locks, and the primary object of the invention is the provision of means for sounding an alarm when an unauthorized person or persons attempts to operate the lock.

Another object of the invention is the provision of means for closing a circuit when an attempt is made to operate the look, so as to sound an alarm or light a light.

A further object of the invention is the provision of an alarm lock having means for sounding an alarm when a skeleton key is inserted in the lock for actuating the looking bolt.

A still further object of the invention is the provision of means, after the alarm has been sounded, for automatically locking the bolt against movement until the alarm is cut off by the key, which actuates the bolt, so as to actually prevent the look from being picked.

With these and other objects in view, the invention consists inthe novel construction, arrangement and formation of'parts, as will be hereinafter more specifically described, claimed and illustrated in the accompanying drawings forming a part thereof in which:

Figure 1 is a fragmentary edge elevation of the door showing a portion of the contacts in section.

Fig. 2 is a detail section through the door casing showing the contacts carried thereby.

Fig. 3 is a detail horizontal section through the door and casing showing contacts carried by the door and casing in engagement.

Fig. 4: is a front elevation of the improved alarm lock with the cover plate removed showing the circuit diagrammatically.

Fig 5 is a transverse section taken on the line 5- 5 of Figfi,

Specification of Letters Patent.

Patented Dec. 16, 1919.

Serial No. 193,500.

Fig. 6 is a fragmentary detail elevation of the lock with the cover plate removed showingdthe same after the signal has been actuate Fig. 7 is a side elevation of the plate for closing the switch.

Fig. 8 is a detail perspective view of the presser foot carried by the plate for actu ating the switch.

Fig. 9 is a detail perspective view of the switch.

Fig. 10 is a plan view of the key for operating the lock.

Referring to the drawings in detail, wherein similar reference numerals designate corresponding parts throughout the several views, the numeral 1 generally indicates the improved alarm lock, which is constructed similar to the ordinary mortise lock and is secured in a door 2 in the ordinary manner. The improved alarm lock 1 includes a casing 3 in which the parts of the lock are mounted and the casing 3 consists of a rear wall 4, upper and lower walls 5 and 6 respectively, side walls '7 and 8 respectively, and a cover plate (not shown), which holds the parts in position.

The side wall 7 is fitted flush with the side edge of the door 2 and is provided with a pair of spaced slots 9 and 10 through which the latch 11 and the locking bolt 12 are adapted to extend. The latch 11 is normally held in its set position by a leaf spring 13 and this latch is operated in the ordinary or any preferred manner by the spindle 14, which carries the operating knob 15.

The locking bolt 12 is slidably mounted in the casing and has its rear end extended upwardly and then rearwardly as at 16 and the lower surface of the bolt is curved as at 17 so as to allow the actuating key 18 to engage the same for sliding the bolt. Formed on the central portion of the rear wall fis an inwardly projecting lug 19 on which pivotally mounted the locking tumbler 20. This lug 19 also formsmeans whereby the cover plate is attached to the lock casing. The locking tumbler is pro-- vided with an inwardly eXtendingslot or gate 21 through which the fence or lug 22, formed on the rear end 16 of the locking bolt 12, slides. The upper wall ofthe slot or 21 is provided zith a downwardly extending lug 23, which is adapted to be engaged on either side thereof by the fence or lug 22,

The tumbler 20 has a forwardly and downwardly extending leg 24, the front end of which is provided with an upwardly extending projection 25, which receives the free end of the spring 26 which extends from a pair of spaced lugs 27 and 28 re spectively carried by the rear wall 4, and this spring holds the tumbler 20 in a down ward position and the lug 23 in engagement with the fence or lug 22. The lower edge of the tumbler 20 is provided with the arcu ate surface 29, which is adapted to be en gaged by the actuating key 18, so as to lift the same against the tension of the spring and allow the fence or lug 22'to slide by the projection 23. Pivotally mounted upon the lug 28 is an actuating plate 30. This plate is provided with an aperture 31 adj acent'its forward end which pivotally receives the lug 28. The rear end of the plate 30 is enlarged as at 32 and it is provided with an en larged opening 33 through which the fence or lug 22 slides. This actuating plate 30 is positioned intermediate the sliding bolt 12 and the tumbler 20. An outwardly ex tending lug 34 is formed on the outer surface of the plate 30 and this lug receives the free end of a leaf spring 35 which extends from the lug 27 and then around the lug 28, and this spring normally holds the plate 30 in a downward position. Pivotally secured tothe actuating plate 30 is an upwardly extending arm 36. The lower end of the'arm is enlarged as at 37 a and is provided with an opening which registers with an aperture 37 in the actuating plate 30, and these registering apertures recelve a pivot pm 38 by means of which the arm 36 is pivotally secured to the plate. The arm 36 extends behind the spring latch bolt 11 and the width of the same is reduced at'this point as at 36 to permit the bolt to readily slide by the arm and the arm has an outwardly formed angular end 39 which forms a presser foot for engaging the switch 40, which will be hereinafter more specifically described. The lower end of the enlarged portion 32 of the plate 30 is provided with an arcuate surface 41 which is adapted to be engaged by the actuating key 18 for raising the same against the tension of the leaf spring 35.

The switch 40 includes a base plate 42 formed of insulating material, which is socured to the rear' wall'4of the lock. A pair of spring arms 43 and 44, respectively, are secured to the opposite ends of the base plate 42, and a pair of electrical conductor wires 45 and 46 is connected with the arms. The inner terminals of the arms 43 and 44 are spaced from each other but are positioned in overlapping relation and the outer arm arm 36, when the actuating plate 30 is forced upward by a skeleton key.

The key 18 for operating the lock includes the stem 48, bow 49 and bit 50. The bit 50 is provided with an inwardly extending slot 51 which divides the same into a pair of spaced parallel legs The legs 52 are provided with inwardly extending recesses 53 which are adapted to engage guides or inwardly extending lugs 54 formed on each side of the keyhole 55 formed in the rear wall and cover plate of the casing. lVhen the key 18 is inserted in the keyhole and turned, the slot 51 receives the actuating plate30 and fails'to move the same and the free ends of one of the legs 52 bear against the under curved side 29 of the tumbler 20' and force the same upwardly, while the other leg 52 engages the curved surface 17 of the locking bolt 12 and actuates the same. It can be seen that as soon as a key which does not contain the slot 51 is inserted in the lock, the plate 30 will be forced upward and thus allow the arm 36 to press the button 47 inward and bridge the gap between the spring arms 43 and 44.

An arm 56 is pivotally secured at its lower end to an inwardly extending lug 57 carried by the rear wall 4 of the casing, and an arcuate leaf spring 58 bears against the upper end of the arm 56, which is provided with the hooked end 59 and normally holds the same in a forward position. The lower end of the leaf spring 58 is secured between the lower end of the arm 56 and the walls of the casing 3. A pin 60 is carried by the central portion of the pivoted arm 56 and this pin bears against the rear curved edge 61 of the actuating plate 30 and the plate normally holds the arm 56in a rearward position against the tension of the spring 58. The lower rear edge of the actuating plate 30 is provided with a cutout portion 62 which provides a shoulder 63 and when the actuating plate 30 is lifted upward the pin 60 will engage the cutout portion 62 and allow the dog'to move inward, and the pin 60 will engage the shoulder 63 and effectively prevent the plate 30 from resuming its normal position and thus hold the sprin arms 43 and 44 in engagement with each other. The upper edge of the tumbler 20 is provided with a recess 64 which receives the hooked end 59 of the locking arm 56 when the same moves inward, and thus the tumbler is prevented from being actuated until the locking arm 56 resumes its normal position and the latch 30 moves downwardly.

The wires 45 and 46 extend upwardly to a.

pair of spaced contacts 65 which are carried secured to the door casing 68. A pair of electrical conductors 69 and 70 lead from the plates 66 to a battery 71 or other source of electrical energy. A bell or other signal 7 2 is interposed in the circuit and when the spring arms 43 and 44 are forced into engagement with each other by the locking plate 30, the circuit will be closed and the bell sounded.

While the switch has been shown as operating an alarm, it is to be understood that the same may be used for closing a cir uit to light the lights of a house, so that when a key is inserted in the lock the house will be immediately illuminated.

In practice, I have found that the form of my invention illustrated in the accompanying drawings and referred to in the above description, as the preferred embodiment, is the most efiicient and practical; yet realizing the conditions concurrent with the adoption of my device will necessarily varj, I desire to emphasize the fact that various minor changes in details of construction, proportion and arrangement of parts may be resorted to, when required without sacrificing any of the advantages of my invention as set forth.

WVhat I claim as new is:

1. In a lock of the class described, a casing, a locking bolt slidably mounted in the casing, -a switch arranged in the casing, a tumbler for engaging said bolt to hold the same in its extended or retracted position, a plate pivotally mounted in the casing and arranged adjacent to said tumbler and adapted to be operated by a skeleton key or the like, means connected to the plate for operating said switch when said plate is actuated, and a dog for engaging said tumbler to prevent movement thereof when said plate is actuated.

2. In a lock of the class described, a looking bolt, a switch arranged above the looking bolt, a tumbler for engaging said bolt to hold the same in its extended or retracted position, a locking dog arranged to engage said tumbler to hold the same against movement, a pivoted plate mounted adjacent to the tumbler and in the path of said dog to normally hold the same out of engagement with the tumbler, and means carried by the plate for operating said switch upon movement of said plate, said plate being adapted to be operated by a skeleton key or the like, as and for the purpose specified.

3. In a lock of the class described, a cas ing, a locking bolt slidably mounted in the casing, a pair of spring contacts mounted in the casing, a tumbler for engaging said bolt to hold the same in its extended or retracted position, a flat plate pivotally mounted in the casing adjacent to said tumbler adapted to be operated by a skeleton key or the like, a dog arranged to normally engage said tumbler to hold the same against movement, said plate being arranged to engage said dog to hold the same out of engagement with the tumbler, and an upwardly extending arm carried by said plate and arranged to engage said contact when the plate is actuated, as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

SIMPSON l3. RODGERS.

Vitnesses C. G. HARD Ewnns, 0. IV. TAYLOR. 

